} catch (Throwable throwable) {
      // Any Exception is either a RuntimeException or sneaky checked exception.
      signalAllWaiters();
      throw throwable;
    }
  }

  /** Signals all threads waiting on guards. */
  @GuardedBy("lock")
  private void signalAllWaiters() {
    for (Guard guard = activeGuards; guard != null; guard = guard.next) {
      guard.condition.signalAll();
    }
  }